What of the hens whom we observe each day at home, with what care and assiduity they govern and guard their chicks? Some let down their wings for the chicks to come under; others arch their backs for them to climb upon; there is no part of their bodies with which they do not wish to cherish their chicks if they can, nor do they do this without a joy and alacrity which they seem to exhibit by the sound of their voices.~ Plutarch. De amore parentis